No credit card required
Browse credit cards from a variety of issuers to see if there's a better card for you.
In my experience the same offer with the checks is also avaliable as a balance transfer. The transfer (either online or over the phone) might be easier than dealing with the checks.
I used a deal like this with Citi, you did a balance transfer (3%, $5 min fee) and then any purchases or transfers after that would be interest free for 18 months. I made a transfer of $150 to my checking account, paid $5, and then made a large purchase on the card which I paid off before the period expired.
Just make sure you continue to make at least your minimum payments in the meantime!!!